Piston.



. No. 889,732. PATENTED JUNE 2, 1908.

W. SNYDER L R. I. MINBR.

PISTON.

APPLICATION FILED NOV. 18, 1907.

unfgn:

WILLIAM SNYDER AND REUBEN I. MINER, OF MONTGOMERY, MICHIGAN.

PIsToN.

specification of Letters Patent.

' Patented .Tune 2, 1908.

Application filed November 18, 1907. Serial No. 402,717.

To all whom it may concer/n.:

Be it known that we, WILLIAM SNYDER and REUBEN I. MINER, citizens of theUnited States, residing at Montgomery, in the county of Hillsdale andState of Michigan, have invented certain new and useful Improvements inPistons, of which the following is a specification.

The present invention relates to valves, pistons, plungers and likedevices arranged to reciprocate in a cylinder or barrel and re uiringpacking to insure and maintain a tig t joint.

The invention deals more particularly with the packing, which is of theself-expansible type so as to automatically com ensate for Wear. Inpistons for pumps, pac ing' of the cup ty e is most generally usedand ispreferred ecause of its self-expanding characteristic and the greatamount of surface in contact with the walls of the cylinder or barrel,hence the present invention is adapted more particularl to this type ofpacking.

For a full un erstanding of the invention and the merits thereof andalso to acquire a knowledge of the details of construction land themeans for effecting the result, reference is to be had Vto the followingdescription and accom anying drawings.

Whi e the invention may be adapted to different forms and conditions bychanges in the structure and minor details` without departing from thespirit or essential features thereof, still the preferred embodiment isshown in the accompanying drawings, in which:

Figure 1 is a vertical sectional section of a piston embodying theinvention. Fig. 2 is a perspective view of the piston. Fig. 3 is aperspective view Iof the packing.

Corresponding and like parts are referred to in the followingdescription and indicated in all the views of the drawings by the samereference characters.

The packing forming the salient feature of the invention com rises a cup1 of leather, rubber or like flexi le material commonly employed in theformation of valve cups for pum s and like apparatus. The cup 1 may be oany size and construction and embodies a horizontal portion to besecured to the body of the Iston, plunger or like part, and a rim encircing the edge of the piston body and adapted to come between the same andthe inner walls of the -cylinder barrel or like part in which the pistonmay be placed. The

valve body, as shown, consists of two disks 2 and 3, each having acentral opening for the passage of the rod 4 and having other openingsabout the central opening for the free passage of the liquid or fluidintended to pass through the piston. The horizontal portion of the cupis clam ed between the two disks 2 and 3 1n any wel known manner,whereas the rim of the cup encrcles the disk 3. The upper disk 3 isrecessed in its to side to receive a valve 5 consisting of a dis ofleather, rubber or like material, the same being secured at a centralpoint and having its edge portions free to move away from the disk 3upon the in or down stroke of the piston to permit of liquid passingthrough and by the valve so as to be lifted thereby upon the up or outstroke of the piston.

Wear pieces 6 are secured to the outer lsurface of the rim of the cupacking 1 and these Wear pieces are of meta such-as brass, copper or thelike, whichl will resist Wear, yet prevent injury to the walls ofthecylinder or arrel in which the valve is arranged to operate. The wearpieces 6 may be secured to the rim of the cup packing in any manner andmay be provided in any number of sections so as to encircle the cuppacking and move with the rim thereof. -The wear pieces may be flexibleor of any thickness depending upon the size and character of work of thepiston.` It will be understood that the wear pieces 6 constitute, ineffect, metallic packing, whereas the cup packing 1 forms a flexibleconnection between said metallic packin and the body of the piston toadmit of the sai metallic packing moving to maintain a close fit betweenthe piston or like part and the walls of the cylinder or barrel 1n whichsaid piston is arranged to reciprocate. In the event of the ends of thewear pieces or metallic packing sections being separated, the rim of thecup packing will be thickened, as shown at 7, to fill the spaces so asto insure a close fit between the packing and the barrel or cylinder atevery oint.

Having thus descri ed the invention, what is claimed as new is:

1. In combination with the body of a pis- 'ton or like part, a sectionalmetallic packing encircling the same and having the ends of the sectionsspaced apart, and an annular flexible connection between the metallicpacking sections and the said iston, said flexible connection havingthic ened portions to fill the spaces formed between the adjacent endsof the metallic packing sections.

2. As a new article of manufacture, a cup packing of flexible materialhaving its rim portion outwardly thickened at intervals,

and wear pieces secured to the outer surface of said rim and arrangedbetween the thickened portions thereof.

In testimony whereof we ai'lix our signa tures 1n presence of twowitnesses.

WILLIAM SNYDER. [L. 5.] REUBEN LMINER. [L. S.]

Witnesses:

JAY WARREN, G. B. HEWITT.

